MU Civil Engineering (Semester 7)
Environmental Engineering - 2
December 2015
Total marks: --
Total time: --
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

1 (a) State principles governing design of building drainage.
5 M
1 (b) List various control measures of air pollution.
5 M
1 (c) Compare one pipe and two pipe system.
5 M
1 (d) The CO content of an air sample is 90μ/m3 at 0°C and 1 atm. Pressure. Convert it to PPM. Assume necessary data.
5 M

2 (a) Draw a neat sketch of automatic flushing tank and explain the operation of flushing.
5 M
2 (b) Design imhoff tank for 25000 people and sewage flow 180 lpcd. Assume data.
10 M
2 (c) Explain the biological action and processor of sludge digestion.
5 M

3 (a) Why de-watering of sludge is necessary? Explain the method of de-watering the sludge on sludge drying beds.
8 M
3 (b) What are the basic differences between aerobic and anaerobic processes.
6 M
3 (c) If 5 day 20° c BOD of waste water is 350 mg/l, what will be the its's 7 days, 25° C BOD? K20=0.1/d. Assume data if required.
6 M

4 (a) Draw the flow chart of the municipal sewage treatment plant by using activated Sludge process and trickling filter.
10 M
4 (b) Determine the size of high rate trickling filter for the following data:
i) Sewage flow 4 M.L.D.
ii) Recirculation ratio = 1.5
iii) BOD5 of raw sewage: 280 mg/1
iv) BOD removal in PST=25%
v) Final effluent BOD5 desired = 30 mg/l.
10 M

5 (a) Explain in detail with sketch sedimentation tank and its design parameters.
8 M
5 (b) Find the volume of digester for population equivalent -7000, loading rate -0.09 kg/capita/day, volatile solids in raw sludge -70%, moisture content of raw sludge -96%, digestion period -25 days, volatile solids reduction during digestion -50%, moisture content of digested sludge -92%, storage period required for digested sludge -90 days.
6 M
5 (c) What is biological treatment process? Explain aerobic and anaerobic process in detail.
6 M

6 (a) Explain intercepting trap in detail.
4 M
6 (b) Explain construction of sewers and steps involved in laying of it.
8 M
6 (c) A 30 cm dia sewer having an invert slope of 1:200 was flowing full. What would be velocity of flow and discharge? (n=0.013). Is the velocity self-cleasing? What would be velocity and discharge, when the same is flowing 0.2 and 0.8 of its full depth?
Proportionate depth (d/D) Proportionate velocity (v/V) Proportionate discharge (q/Q)
0.2 0.615 0.088
0.4 0.902 0.3364
0.6 1.072 0.6711
0.8 1.140 0.9781
8 M

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